Prior to being into Facebook's GitHub, it was into a Yann's GitHub, with different license terms. Someone could fork it, keeping the compatibility with the late

Prior to being into Facebook's GitHub, it was into a Yann's GitHub, with different license terms. Someone could fork it, keeping the compatibility with the latest API. It could be enough for FB being pragmatic and releasing it under a more permissive license (in my opinion they should, making wider adoption easier).